java.lang.NoClassDefFoundError: org/hibernate/criterion/Criterion

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myeclipse 5.5，JDK1.6,tomcat6.0,mysql5.145

LoginWeb，LoginWeb02，LoginWeb03，LoginWeb04，配置了hibernate,一共配置了四次，，但是 LoginWeb02有问题，其他三个没问题，真不知道怎么回事，，，

2011-8-7 16:51:06 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet LoginSvlt threw exception
java.lang.NoClassDefFoundError: org/hibernate/criterion/Criterion
at com.qdu.sun.LoginSvlt.doPost(LoginSvlt.java:75)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.qdu.sun.FormFilter.doFilter(FormFilter.java:75)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Unknown Source)